when the fire police got there the building was on fire,but on one knew
题目
when the fire police got there the building was on fire,but on one knew
when the building ____ fire.A had caught B caught A还是 B,请指教
答案
B 有过去的时态为跳板才可以出现过去完成时!如By the time I arrived at the building,it had caught fire!
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点